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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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H8/3028F Folha de dados(PDF) 69 Page - Renesas Technology Corp |
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H8/3028F Folha de dados(HTML) 69 Page - Renesas Technology Corp |
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69 / 923 page  Rev. 2.00, 09/03, page 39 of 890 2.6.5 Notes on Use of Bit Manipulation Instructions The BSET, BCLR, BNOT, BST, and BIST instructions read a byte of data, modify a bit in the byte, then write the byte back. Care is required when these instructions are used to access registers with write-only bits, or to access ports. Step Description 1 Read Read one data byte at the specified address 2 Modify Modify one bit in the data byte 3 Write Write the modified data byte back to the specified address Example 1: BCLR is executed to clear bit 0 in the port 4 data direction register (P4DDR) under the following conditions. P47, P46: Input pins P45 – P40: Output pins The intended purpose of this BCLR instruction is to switch P40 from output to input. Before Execution of BCLR Instruction P47 P46 P45 P44 P43 P42 P41 P40 Input/output Input Input Output Output Output Output Output Output DDR 0011 1111 |
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